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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1eeffc845409f6c0ebfe2542f13b19c5fd592fe00b415359d66412cbb2e92a' 
  AND token = '0eTryqU8VLsik2UD4yICtH8g7bmxDn/gQo8pk/YTXys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}